THE GYMNOTID EELS OF TROPICAL AMERICA. 143 
3188 C. M., two, 480 and 500 mm. Alcoboca, Rio Tocantins, Jan. 10, 1910, 
Haseman. 
3189 C. M., three, 400-425 mm. Parad, Jan. 22, 1910, Haseman. 
Head 8.5 to 9.5, greatest depth of body 9.75 to 10.75 in the length to the base 
of the caudal; anal rays (Para) 248, (Aleoboca) 239, 254, 263 (other Para speci- 
mens had regenerated caudals). Snout 1.6 to almost 2; interorbital 6.5 to 8.5 in 
the head; eye 12 to 15 in the snout and 3 to 5 in the interorbital. 
Fie. 10. Sternarchorhamphus miilleri (Steindachner). 
Body quite compressed and elongate; head compressed and somewhat pro- 
duced; width of the head 3 to 3.8; depth of the head in the occipital region 1.5 to 
almost 2 in the greatest depth of the body; anus about the diameter of the eye in 
front of the vertical from the anterior margin of the eye; dorsal profile almost 
straight, sloping slightly from the origin of the dorsal filament; ventral profile 
behind the head weakly convex. 
Snout produced, tubular, almost straight, slightly upturned and slightly 
enlarged toward the tip; mouth medium; gape straight, oblique to the axis of the 
head and equal to about one fourth of the snout; jaws equal, both rounded in front; 
lower included on the sides; teeth small, villiform, in a band of three or more 
series around the lower jaw and a band of two or more series on the side and six or 
seven series in the middle on the upper jaw. 
Caudal fin quite small, 3 to 4 in the snout; pectorals a little more or less than 
2 in the head. 
Ground-color tawny to dark brown; entire body overlaid more or less with 
fine violet dots, especially in the region of the lateral line, the dorsal and lateral 
portions of the head, and the dorsal portion of the body; anal and pectorals bright 
yellow margined with black; caudal pale yellow; a dark patch at origin of lateral 
line; scales small, larger in the region of the lateral line; middorsal region unscaled. 
Known only from the lower Amazon. 
